[dhowells-fs:fscache-cache-2 84/84] fs/cachefiles/interface.c:113:20: warning: variable 'object' is uninitialized when used here

[dhowells-fs:fscache-cache-2 84/84] fs/cachefiles/interface.c:113:20: warning: variable 'object' is uninitialized when used here

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-cache-2
head:   8c0dade745a9bacc037c10f7fb0f1900738ebd47
commit: 8c0dade745a9bacc037c10f7fb0f1900738ebd47 [84/84] cachefiles: Overhaul index
config: arm64-randconfig-r035-20210401 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 1c268a8ff4e90a85d0e634350b1104080614cf2b)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?id=8c0dade745a9bacc037c10f7fb0f1900738ebd47
        git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
        git fetch --no-tags dhowells-fs fscache-cache-2
        git checkout 8c0dade745a9bacc037c10f7fb0f1900738ebd47
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> fs/cachefiles/interface.c:113:20: warning: variable 'object' is uninitialized when used here [-Wuninitialized]
           _enter("{OBJ%x}", object->debug_id);
                             ^~~~~~
   fs/cachefiles/internal.h:334:17: note: expanded from macro '_enter'
                   kenter(FMT, ##__VA_ARGS__);             \
                                 ^~~~~~~~~~~
   fs/cachefiles/internal.h:320:65: note: expanded from macro 'kenter'
   #define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
                                                                   ^~~~~~~~~~~
   fs/cachefiles/internal.h:318:46: note: expanded from macro 'dbgprintk'
           printk("[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
                                                       ^~~~~~~~~~~
   fs/cachefiles/interface.c:107:34: note: initialize the variable 'object' to silence this warning
           struct cachefiles_object *object;
                                           ^
                                            = NULL
   1 warning generated.


vim +/object +113 fs/cachefiles/interface.c

   101	
   102	/*
   103	 * Attempt to look up the nominated node in this cache
   104	 */
   105	static bool cachefiles_bind_cookie(struct fscache_cookie *cookie)
   106	{
   107		struct cachefiles_object *object;
   108		struct cachefiles_cache *cache = cookie->volume->cache->cache_priv;
   109		const struct cred *saved_cred;
   110		char *lookup_key;
   111		bool success;
   112	
 > 113		_enter("{OBJ%x}", object->debug_id);
   114	
   115		object = cachefiles_alloc_object(cookie);
   116		if (!object)
   117			goto fail;
   118	
   119		lookup_key = cachefiles_prepare_lookup_data(object);
   120		if (!lookup_key)
   121			goto fail_obj;
   122	
   123		/* look up the key, creating any missing bits */
   124		cachefiles_begin_secure(cache, &saved_cred);
   125		success = cachefiles_walk_to_object(object, lookup_key);
   126		cachefiles_end_secure(cache, saved_cred);
   127		kfree(lookup_key);
   128	
   129		if (!success)
   130			goto fail_obj;
   131	
   132		cookie->cache_priv = object;
   133		spin_lock(&cache->object_list_lock);
   134		list_add(&object->cache_link, &cache->object_list);
   135		spin_unlock(&cache->object_list_lock);
   136		cachefiles_attr_changed(object);
   137		_leave(" = t");
   138		return true;
   139	
   140	fail_obj:
   141		cachefiles_put_object(object, cachefiles_obj_put_alloc_fail);
   142	fail:
   143		return false;
   144	}
   145	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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